UE-31447

When playing matinee, scrubbing can cause sound to keep playing when it isn't triggered

When playing matinee, scrubbing can cause sound to keep playing when it isn't triggered

Description

When playing matinee, scrubbing can cause sound to keep playing when it isn't triggered

Note: This was entered as a bug to re-work the fix from the pull request found here: UE-27709

Steps to Reproduce

1. Download and import the attached WAV file
2. Create a sound cue from the sound wave
3. Create a matinee in your level and make it last 10 seconds
4. Create an empty group and add a sound track to it
5. Select the Sound Cue in the content browser
6. Scrub to 6 seconds with the Sound Track selected and hit enter
7. Scrub to 5 seconds and play
8. When it gets to 8 seconds or so, scrub it back to 3 seconds
9. Hit play again

Result: Sound plays immediately, but as if it was at the 8 second mark
Expected: No sound at all because the sound is not triggered at 3 seconds

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